Whoosh thermal r&d or greddy

[scoobtothenoog]

What's the difference between the Woosh spec Thermal and the standard one? I was looking over the descriptions and didn't see anything that jumps out as different other than the black tips.

 

[hawyee]

Brushed pipes vs stainless and black tips.

 

[scoobtothenoog]

I read some say these have a hemholtz resonator?? Are those silly pipes in parallel to the primary? Looks like a regular straight through resonator on the pictures to me.